import { readFileSync } from "fs"; const t0 = performance.now(); const input = readFileSync("input.txt") .toString() .split(/\r*\n/) .filter((e) => e.length > 0) .map((a, j) => a .split("") .map((b, i) => ({ c: +b, x: i, y: j, d: 0, h: 0 }))); console.log(input[0].slice(-1)[0]); const t1 = performance.now(); console.log(`Runtime: ${t1 - t0}ms`);